The image acknowledged as the world’s first photograph — taken by a French inventor in 1826 — has passed its first full-scale analysis with flying colors and is now awaiting an airtight case that will keep it safe for centuries to come, scientists said on Wednesday.

The faint 8-inch by 6.5-inch image of the French countryside, captured by Joseph Nicephore Niepce on a thin pewter plate, has been undergoing a high-tech check-up by scientists at the Getty Conservation Institute in a joint project with French photo conservationists.